scispace - formally typeset
Search or ask a question

Showing papers in "Journal of Sound and Vibration in 1986"


Journal ArticleDOI
TL;DR: In this paper, a set of beam characteristic orthogonal polynomials in the Rayleigh-Ritz method was used to obtain the natural frequencies of rectangular plates. But the results for lower modes were not as good as those obtained by other methods.

469 citations


Journal ArticleDOI
TL;DR: In this paper, a piecewise linear displacement field which allows the contact conditions for the displacements and the transverse shearing stresses at the interfaces to be satisfied simultaneously, the nonlinear (in the von Karman sense) equations of motion for thick multilayered orthotropic plates are developed.

372 citations


Journal ArticleDOI
TL;DR: Criteria are established to distinguish veerings from crossings in both continuous and discretized models and the existence of curve veering in continuous models is illustrated by presenting the exact solution of an elementary eigenvalue problem.

345 citations


Journal ArticleDOI
TL;DR: In this paper, the relationship between broadband shock associated noise and screech tones is examined and it is shown that from the spectral characteristics point of view, the screech tone may be regarded as a special case of broadband wave associated noise.

294 citations


Journal ArticleDOI
TL;DR: In this paper, a mathematical model of an unloaded symmetric rotor supported by one rigid and one fluid lubricated bearing is proposed, where the rotor model is represented by generalized (modal) parameters of its first bending mode.

270 citations


Journal ArticleDOI
TL;DR: In this paper, the response of a single degree of freedom system with dry friction is considered and the asymptotic stability of the steady state motions and some transient behaviors are also determined.

262 citations


Journal ArticleDOI
TL;DR: In this article, a response function is derived for an infinite, uniform, one-dimensional structure which is subjected to an array of harmonic forces or moments, spaced equidistantly, and which have a constant phase or ratio between any adjacent pair.

188 citations


Journal ArticleDOI
TL;DR: In this paper, a physically motivated, continuous microslip model of friction is developed for analyzing the dynamic response of frictionally damped structures in which the friction interface is subjected to high normal loads.

185 citations


Journal ArticleDOI
N.S. Putcha1, J. N. Reddy1
TL;DR: In this paper, a mixed shear flexible finite element, with relaxed continuity, is developed for the geometrically linear and nonlinear analysis of layered anisotropic plates, based on a refined higher order theory which satisfies the zero transverse shear stress boundary conditions on the top and bottom faces of the plate and requires no shear correction coefficients.

174 citations


Journal ArticleDOI
TL;DR: In this article, orthogonal polynomial functions are used in the Rayleigh-Ritz method to generate results for a number of flexural vibration and buckling problems for rectangular isotropic and orthotropic plates.

169 citations


Journal ArticleDOI
TL;DR: In this article, Schlieren photographs of the flow field along with hot-wire measurements in the jet were obtained at different pressure ratios and it was shown that the self-excitation helps to induce large scale vortical motions in a converging rectangular nozzle.

Journal ArticleDOI
TL;DR: In this paper, a procedure for generalizing harmonic balance to obtain higher-order approximations to the periodic solutions of differential equations for two systems, one a conservative system and the other non-conservative, is presented.

Journal ArticleDOI
TL;DR: The theoretical and experimental status of helicopter impulsive noise is reviewed in this article, where two major sources of helicopter noise are addressed: high-speed impulsive noises and blade- vortex interaction noise.

Journal ArticleDOI
TL;DR: In this article, a 2.54 cm diameter air jet at a Mach number of 0.50 and a Reynolds number of 300,000 was used to calibrate subsonic jet noise theories, showing that large scale coherent structures of the jet govern the source locations by controlling the turbulence and also strongly influence the near field pressure fluctuations.

Journal ArticleDOI
TL;DR: In this paper, a rotating uniform cantilever beam with a tip mass was studied by using beam characteristic orthogonal polynomials in the Rayleigh-Ritz method, and the results were compared with those obtained by the Myklestad method, the extended Galerkin method and finite element methods.

Journal ArticleDOI
TL;DR: In this article, the influence of microslip on the resonant response of structures that are restrained by a friction contact is discussed, and a new model of micro-slip described in the companion paper is used in simulating the vibratory response of three sets of experiments.

Journal ArticleDOI
TL;DR: In this paper, the effects of tip clearance on both noise and performance of four commercially representative fans (three low pressure axial flow and one mixed flow) in a circular duct, both with and without coincidence of the fan and duct axes (fan/duct eccentricity).

Journal ArticleDOI
TL;DR: In this article, the effects of the thickness of the plate and the diameter of the holes on the impedance of the perforate have been included, and it is found from the results that resistance increases with the grazing flow velocity, but is more or less independent of thickness and hole diameter.

Journal ArticleDOI
TL;DR: In this article, a simple theoretical model has been developed from first principles for cross flow induced fluid-elastic instabilities in heat exchanger tube bundles, which includes the effects of tube array pattern and pitch.

Journal ArticleDOI
TL;DR: In this article, the interaction between flow and flow-induced acoustic resonances near rigid plates with square leading edges located in a hard-walled duct is described, and a potential flow model for a plate with a square leading edge is developed and the acoustic power generated by vortices, which grow and shed from the leading edge, is calculated as they move through the resonant acoustic field.

Journal ArticleDOI
TL;DR: In this paper, a single microphone output is de-Dopplerized, and results from a Lockheed TriStar graphically illustrate the capability of the de-dopplerization for the analysis of noise from counterrotating propeller driven aircraft.


Journal ArticleDOI
TL;DR: Theoretical stability threshold curves are determined for standard heat exchanger tube bundle geometries based on the first principles model developed in Part I. as mentioned in this paper, and an investigation into the sensitivity of the predicted threshold curves on variations in model parameters is also presented.

Journal ArticleDOI
TL;DR: In this article, an exact conservation equation is developed which generalizes the familiar acoustic energy equation for arbitrary homentropic disturbances to a homentropy steady flow, and a perturbation energy density and flux are defined and identified as the exact physical quantities whose leading order representations are the usual acoustic energy densities and flux.

Journal ArticleDOI
TL;DR: In this paper, an approximate solution of the title problem is obtained by using the Rayleigh-Schmidt approach, which yields accurate engineering results which in the case of a uniform cantilever beam are in very good agreement with To's eigenvalues.

Journal ArticleDOI
TL;DR: In this article, a cylindrical shell which is reinforced at regular intervals by flexible stiffeners parallel to the shell generator is considered, and the structure effectively constitutes a one-dimensional periodic system and is analyzed as such.

Journal ArticleDOI
TL;DR: In this article, a 12-d.o.f, geometrically non-linear, doubly curved, thin shell finite element of revolution with laminate composite materials was used for free vibration analysis of a pneumatic tire without suspension.

Journal ArticleDOI
TL;DR: In this article, a theoretical analysis of the effect of an elastic foundation and various damping forces on the stability of a fluid-conveying pipe is presented, and the results of extensive numerical calculations are presented in the form of diagrams.

Journal ArticleDOI
TL;DR: In this paper, the forced vibration of a system of coupled beams is examined and it is shown that violent non-synchronous torsion and bending vibration observed in such a system may be explained by the existence of quadratic nonlinear coupling terms and internal resonance effects between three and four modes.

Journal ArticleDOI
TL;DR: The dynamic stability of supported cylindrical pipes converying fluid, when the flow velocity is harmonically perturbed about a constant mean value, is considered in this paper, and explicit stability conditions for perturbations of small intensity are obtained by using the method of averaging.